Study of Quasi-Particle Recombination Rate by Injection Experiment Using Narrow Superconducting Wire and DC-SQUID Junctions

We observed recombination time dependent on the quasi particle density by performing injection experiments using multi-terminal device consisting of a narrow aluminum wire and DC-SQUID junctions. At low temperatures where injected quasi-particle density are considerably larger than that of thermally...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2009-05, Vol.78 (5), p.54704
Main Authors: YAGI, Ryuta, TSUBOI, Kazuki, MORIMOTO, Ryohei, MATSUMURA, Toru, KOBARA, Hiroaki
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions
Superconductivity
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Summary:We observed recombination time dependent on the quasi particle density by performing injection experiments using multi-terminal device consisting of a narrow aluminum wire and DC-SQUID junctions. At low temperatures where injected quasi-particle density are considerably larger than that of thermally excited quasi-particles, we found that the relaxation length of the quasi-particle density reduced about 30% when the injection current was increased from 200 to 600 nA. The result could be interpreted as the intrinsic quasi-particle recombination time proportional to the square of quasi-particle density.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.78.054704